Re: JTOPEN FTP Through a Firewall question

The FTP classes uses passive mode when listing files on the server.
Passive mode means a port other than the default FTP port is used to
exchange data.  Is it possible the second port is not open through the
firewall?  I had some confidence that this was it until I realized put also
uses passive mode.  Why would put work when list doesn't?  Could be the ftp
server is set up to handle get/put via passive mode, but not list?

David Wall
AS/400 Toolbox for Java


"Bennion, Dick" <Dick_Bennion@AFCC.com>@midrange.com on 01/09/2001 11:52:33
AM

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To:   "'JAVA400-L@midrange.com'" <JAVA400-L@midrange.com>
cc:
Subject:  JTOPEN FTP Through a Firewall question



I am using the jtopen version of the toolkit and I am attempting to
communicate with a number of sites that are outside our firewall.  I am
able
to get and put files, but I am having a problem getting a listing of the
files in the current working directory.  I am using the FTP class.

If I am accessing the server directory without going through the firewall
everything goes perfectly.

When I attempt ls through the firewall the list of files returned is always
empty.  The message returned is "226 Listing completed."

I found some documentation that talks about using Rbind() from the client
to
establish an inbound connection.

What should I do to be able to get a list of the files in a directory on
the
server?  All help would be much appreciated.




> Dick Bennion



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